Allan, I guess this statement; Would most people agree to a minimum thickness 9 inches from the muzzle at 0.023 to 0.024?, would depend on what type of hull pressure shell you are using. I
would say that a low pressure, low recoil shell would be fine. I know that some of the British guns have a thinner wall thickness due to keeping the guns light.
In guns that have been honed out and in your example of going from .729 to .740, that .011 would be .0055 less wall diameter meaning now .024-.0055 or .0185 wall thickness, and yes I would say that is too thin and would definitely be out of proof.
Last edited by JDW; 02/18/10 11:53 AM.
